ENTRY 22995 20211103 230522995 0 1 SUBENT 22995001 20211103 230522995 1 1 BIB 16 81 22995 1 2 TITLE The 14-C(n,gamma) cross section between 10 keV 22995 1 3 and 1 MeV 22995 1 4 AUTHOR (R.Reifarth, M.Heil, C.Forssen, U.Besserer, A.Couture, 22995 1 5 S.Dababneh, L.Doerr, J.Goerres, R.C.Haight,F.Kaeppeler,22995 1 6 A.Mengoni, S.O'Brien, N.Patronis, R.Plag, R.S.Rundberg,22995 1 7 M.Wiescher, J.B.Wilhelmy) 22995 1 8 REFERENCE (J,PR/C,77,015804,2008) Main reference. New analysis, 22995 1 9 Final results. 22995 1 10 (R,INDC(GER)-0053,2021) Revised values of Karlsruhe 22995 1 11 cross sections. 22995 1 12 (C,2006CERN,,(223),200606) Re-analysis of prelim.data. 22995 1 13 Paper number 223. 22995 1 14 (J,NP/A,758,787,2005) Preliminary results 22995 1 15 REL-REF (I,,A.Antilla+,J,NIM,147,501,1977) Experimental details22995 1 16 and C-15 decay-data 22995 1 17 (I,,H.Beer+,J,NIM/A,337,492,1994) Experimental details 22995 1 18 (A,,H.Beer+,J,AJ,387,258,1992) Previous activation 22995 1 19 result for Maxwell-averaged cross section with 22995 1 20 kT=23.3 keV. Agrees, if new sample mass is taken into 22995 1 21 account and a similar dead-time problem like during 22995 1 22 this experiment is assumed. 22995 1 23 INSTITUTE (2GERKFK) Forschungszentrum Karlsruhe, Institut fuer 22995 1 24 Kernphysik, Germany. F.Kaeppeler, R.Plag, 22995 1 25 S.Dababneh, M.Heil; 22995 1 26 Forschungszentrum Karlsruhe, Tritiumlabor. L.Doerr, 22995 1 27 U.Besserer. 22995 1 28 (1USALAN) Los Alamos National Laboratory, Los Alamos, 22995 1 29 New Mexico, USA. R.Reifarth, A.Couture, R.C.Height, 22995 1 30 R.S.Rundberg, J.B.Wilhelmy. 22995 1 31 (1USALRL) Lawrence Livermore National Laboratory, 22995 1 32 Livermore, California, USA. C.Forssen, N.Patronis. 22995 1 33 (2SWDCTH) Fundamental Physics, Chalmers University 22995 1 34 of Technology, Goeteborg, Sweden. C.Forssen. 22995 1 35 (1USANOT) University of Notre Dame, Physics Depart., 22995 1 36 Notre Dame, Indiana, USA. S.O'Brien, J.Goerres, 22995 1 37 M.Wiescher. 22995 1 38 (2ZZZCER) CERN, CH-1211 Geneva 23, Switzerland. 22995 1 39 A.Mengoni. 22995 1 40 (2GRCIOA) Nuclear Physics Laboratory, Department of 22995 1 41 Physics, The University of Ioannina, Ioannina, 22995 1 42 Greece. N.Patronis. 22995 1 43 FACILITY (VDG,2GERKFK) 3.7 MV Van de Graaff accelerator 22995 1 44 ANALYSIS The main difference of this article data from that 22995 1 45 of the preliminary in REFERENCE NP/A,758 is discovery 22995 1 46 of the huge dead time effect during the experiment. 22995 1 47 METHOD (ACTIV) Cyclic activation technique 22995 1 48 (GSPEC) 22995 1 49 INC-SOURCE (P-LI7) A metallic Li-7 target of different Li-7 layer 22995 1 50 thicknesses with protons of different energies above 22995 1 51 the (P,N) reaction threshold. 22995 1 52 INC-SPECT Spectrum at the place of the sample is determined 22995 1 53 by averaging of the down- and upstream gold monitor 22995 1 54 samples. 22995 1 55 Neutron fluxes between 1.E+7 - 1.E+9 1/cm**2/s . 22995 1 56 DETECTOR (HPGE) A High-purity germanium detector with a relative22995 1 57 efficiency of 100%. The detector efficiency was 22995 1 58 determined with a set of calibration sources and via 22995 1 59 the 13-Al-27(P,G)14-Si-28 reaction. 22995 1 60 CORRECTION Correction for dead time of about factor of three (!) 22995 1 61 MONITOR (79-AU-197(N,G)79-AU-198-G,,SIG,,MXW) 22995 1 62 (13-AL-27(P,G)14-SI-28,,SIG) For detector calibration 22995 1 63 SAMPLE C-14 mass was determined with the help of its BETA- 22995 1 64 activity and is 283 +- 3 mg. The sample was 22995 1 65 sandwiched between two thin gold foils. 22995 1 66 ERR-ANALYS (ERR-T) Total error equal to quadratic sum of its 22995 1 67 constituents 22995 1 68 (ERR-S,2.,8.) Error of counting statistics 2.-8.%. 22995 1 69 (ERR-1) Error due to the gamma detector efficiency 22995 1 70 (ERR-2,2.,10.) error of the negutron flux determination22995 1 71 * all other uncertainties are smaller than 2%. 22995 1 72 HISTORY (20080214C) SM 22995 1 73 (20081222A) M.M. Reference 2007CERN,223 was added. 22995 1 74 Reference (J,AJ,387,258,1992) was moved in REL-REF 22995 1 75 lines (previous activation result). 22995 1 76 ERR-ANALYS was corrected, ERR-S, ERR-2, ERR-3 were 22995 1 77 deleted from COMMON as min/max errors. 22995 1 78 (20101105A) SD: ERR-ANALYS corrected: min/max errors 22995 1 79 are shown in description. 22995 1 80 (20170825U) SD: Syntax of 2006CERN ref. corrected. 22995 1 81 (20211103A) SD: Corrections in all Subents. 22995 1 82 Subent 004 added. 22995 1 83 ENDBIB 81 0 22995 1 84 COMMON 1 3 22995 1 85 ERR-1 22995 1 86 PER-CENT 22995 1 87 5. 22995 1 88 ENDCOMMON 3 0 22995 1 89 ENDSUBENT 88 0 22995 199999 SUBENT 22995002 20211103 230522995 2 1 BIB 9 13 22995 2 2 REACTION (6-C-14(N,G)6-C-15,,SIG,,MXW) 22995 2 3 INC-SOURCE Li-7 target thickness is 30 u-m, proton energy is 22995 2 4 1912 keV, 30 keV above Li-7(p,n) reaction threshold 22995 2 5 INC-SPECT Spectrum can be approximated by Maxwellian with 22995 2 6 temperature kT = 23.3 keV 22995 2 7 DECAY-MON (79-AU-198-G,2.694D,DG,411.8,0.9552) 22995 2 8 MONIT-REF (22099002,W.Ratynski+,J,PR/C,37,595,1988) 22995 2 9 ERR-ANALYS (MONIT-ERR) Uncertainty in monitor reaction 22995 2 10 COMMENT Note that in this case the neutron energy is 22995 2 11 given in the center-of-mass system 22995 2 12 STATUS (TABLE) Table V of Phys.Rev.,C77(2008)015804 22995 2 13 (SPSDD,22995004) Renormalized. 22995 2 14 HISTORY (20211103A) SD: MONIT/ERR added. Subent superseded. 22995 2 15 ENDBIB 13 0 22995 2 16 COMMON 3 3 22995 2 17 KT-NRM MONIT MONIT-ERR 22995 2 18 KEV MB MB 22995 2 19 25. 586. 8. 22995 2 20 ENDCOMMON 3 0 22995 2 21 DATA 4 1 22995 2 22 KT DATA ERR-T ERR-T 22995 2 23 KEV MICRO-B MICRO-B PER-CENT 22995 2 24 23.3 7.1 0.5 6.7 22995 2 25 ENDDATA 3 0 22995 2 26 ENDSUBENT 25 0 22995 299999 SUBENT 22995003 20211103 230522995 3 1 BIB 9 15 22995 3 2 REACTION (6-C-14(N,G)6-C-15,,SIG,,SPA) 22995 3 3 INC-SOURCE Li-7 target thickness is 5 mu-m, proton energies are 22995 3 4 2001 - 2530 keV, above Li-7(p,n) reaction threshold 22995 3 5 INC-SPECT Unsymmetric broad neutron spectrum with resolution 22995 3 6 taken by compiler from Fig.3 of main reference. 22995 3 7 Spectra are typical for mono-energetic experiment with22995 3 8 wide energy uncertainty (for 150 and 500 keV). 22995 3 9 DECAY-MON (79-AU-198-G,2.694D,DG,411.8,0.9552) 22995 3 10 MONIT-REF (22099002,W.Ratynski+,J,PR/C,37,595,1988) 22995 3 11 MISC-COL (MISC) Proton energy 22995 3 12 ERR-ANALYS (ERR-SYS) Systematic error 22995 3 13 STATUS (TABLE) Table V of Phys.Rev.,C77(2008)015804 22995 3 14 (CURVE) Spectrum width EN-RSL-FW taken from the 22995 3 15 curves Fig.3, #2-#3-#4 from above 22995 3 16 HISTORY (20211103U) SD: MONIT-REF added from Subent 001. 22995 3 17 ENDBIB 15 0 22995 3 18 NOCOMMON 0 0 22995 3 19 DATA 7 3 22995 3 20 EN-MEAN EN-RSL-FW DATA ERR-T ERR-T ERR-SYS 22995 3 21 MISC 22995 3 22 KEV KEV MICRO-B MICRO-B PER-CENT PER-CENT 22995 3 23 KEV 22995 3 24 150. 9. E+01 10.7 1.2 11. 22995 3 25 2001. 22995 3 26 500. 1.3 E+02 17.0 1.5 8.8 22995 3 27 2291. 22995 3 28 750. 1.5 E+02 15.8 1.6 10. 5. 22995 3 29 2530. 22995 3 30 ENDDATA 10 0 22995 3 31 ENDSUBENT 30 0 22995 399999 SUBENT 22995004 20211103 230522995 4 1 BIB 10 16 22995 4 2 REACTION 1((6-C-14(N,G)6-C-15,,SIG,,MXW)/ 22995 4 3 (79-AU-197(N,G)79-AU-198,,SIG,,SPA)) 22995 4 4 2(6-C-14(N,G)6-C-15,,SIG,,MXW) 22995 4 5 INC-SOURCE Li-7 target thickness is 30 mu-m, proton energy is 22995 4 6 1912 keV, 30 keV above Li-7(p,n) reaction threshold 22995 4 7 INC-SPECT Spectrum can be approximated by Maxwellian with 22995 4 8 temperature kT = 23.3 keV 22995 4 9 DECAY-MON (79-AU-198-G,3881.0MIN,DG,411.80,0.9558) 22995 4 10 MONIT-REF (,R.Reifarth+,J,EPJ/P,133,424,2018) 22995 4 11 ANALYSIS Cross section value in Subent 22995.002 is 22995 4 12 renormalized for new gold cross section 22995 4 13 CORRECTION Correction for revised gold standard: 622.7/586 =1.06222995 4 14 COMMENT Note that in this case the neutron energy is 22995 4 15 given in the center-of-mass system 22995 4 16 STATUS (TABLE) Table from p.256 of INDC(GER)-0053 22995 4 17 HISTORY (20211103C) SD 22995 4 18 ENDBIB 16 0 22995 4 19 NOCOMMON 0 0 22995 4 20 DATA 6 1 22995 4 21 KT DATA 1ERR-T 1DATA 2ERR-T 2ERR-T 222995 4 22 KEV NO-DIM NO-DIM MICRO-B MICRO-B PER-CENT 22995 4 23 23.3 0.122E-04 0.008E-04 7.5 0.5 6.6 22995 4 24 ENDDATA 3 0 22995 4 25 ENDSUBENT 24 0 22995 499999 ENDENTRY 4 0 2299599999999